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<h4 class="subsection">6.1.4 Manipulating Structures</h4>
<p>Other functions that can manipulate the fields of a structure are given below.
<!-- ov-struct.cc -->
<p><a name="doc_002drmfield"></a>
<div class="defun">
— Built-in Function: <b>rmfield</b> (<var>s, f</var>)<var><a name="index-rmfield-375"></a></var><br>
<blockquote><p>Remove field <var>f</var> from the structure <var>s</var>. If <var>f</var> is a
cell array of character strings or a character array, remove the
named fields.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dcellstr.html#doc_002dcellstr">cellstr</a>, <a href="doc_002discellstr.html#doc_002discellstr">iscellstr</a>, <a href="doc_002dsetfield.html#doc_002dsetfield">setfield</a>.
</p></blockquote></div>
<!-- ./miscellaneous/setfield.m -->
<p><a name="doc_002dsetfield"></a>
<div class="defun">
— Function File: [<var>k1</var>, <small class="dots">...</small>, <var>v1</var>] = <b>setfield</b> (<var>s, k1, v1, <small class="dots">...</small></var>)<var><a name="index-setfield-376"></a></var><br>
<blockquote><p>Set field members in a structure.
<pre class="example"> oo(1,1).f0 = 1;
oo = setfield (oo, {1,2}, "fd", {3}, "b", 6);
oo(1,2).fd(3).b == 6
⇒ ans = 1
</pre>
<p>Note that this function could be written
<pre class="example"> i1 = {1,2}; i2 = "fd"; i3 = {3}; i4 = "b";
oo(i1{:}).(i2)(i3{:}).(i4) == 6;
</pre>
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dgetfield.html#doc_002dgetfield">getfield</a>, <a href="doc_002drmfield.html#doc_002drmfield">rmfield</a>, <a href="doc_002disfield.html#doc_002disfield">isfield</a>, <a href="doc_002disstruct.html#doc_002disstruct">isstruct</a>, <a href="doc_002dfieldnames.html#doc_002dfieldnames">fieldnames</a>, <a href="doc_002dstruct.html#doc_002dstruct">struct</a>.
</p></blockquote></div>
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<p><a name="doc_002dorderfields"></a>
<div class="defun">
— Function File: [<var>t</var>, <var>p</var>] = <b>orderfields</b> (<var>s1, s2</var>)<var><a name="index-orderfields-377"></a></var><br>
<blockquote><p>Return a struct with fields arranged alphabetically or as specified
by <var>s2</var> and a corresponding permutation vector.
<p>Given one struct, arrange field names in <var>s1</var> alphabetically.
<p>Given two structs, arrange field names in <var>s1</var> as they appear
in <var>s2</var>. The second argument may also specify the order in
a permutation vector or a cell array of strings.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dgetfield.html#doc_002dgetfield">getfield</a>, <a href="doc_002drmfield.html#doc_002drmfield">rmfield</a>, <a href="doc_002disfield.html#doc_002disfield">isfield</a>, <a href="doc_002disstruct.html#doc_002disstruct">isstruct</a>, <a href="doc_002dfieldnames.html#doc_002dfieldnames">fieldnames</a>, <a href="doc_002dstruct.html#doc_002dstruct">struct</a>.
</p></blockquote></div>
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<p><a name="doc_002dfieldnames"></a>
<div class="defun">
— Built-in Function: <b>fieldnames</b> (<var>struct</var>)<var><a name="index-fieldnames-378"></a></var><br>
<blockquote><p>Return a cell array of strings naming the elements of the structure
<var>struct</var>. It is an error to call <code>fieldnames</code> with an
argument that is not a structure.
</p></blockquote></div>
<!-- ov-struct.cc -->
<p><a name="doc_002disfield"></a>
<div class="defun">
— Built-in Function: <b>isfield</b> (<var>expr, name</var>)<var><a name="index-isfield-379"></a></var><br>
<blockquote><p>Return true if the expression <var>expr</var> is a structure and it includes an
element named <var>name</var>. The first argument must be a structure and
the second must be a string.
</p></blockquote></div>
<!-- ./miscellaneous/getfield.m -->
<p><a name="doc_002dgetfield"></a>
<div class="defun">
— Function File: [<var>v1</var>, <small class="dots">...</small>] = <b>getfield</b> (<var>s, key, <small class="dots">...</small></var>)<var><a name="index-getfield-380"></a></var><br>
<blockquote><p>Extract fields from a structure. For example
<pre class="example"> ss(1,2).fd(3).b = 5;
getfield (ss, {1,2}, "fd", {3}, "b")
⇒ ans = 5
</pre>
<p>Note that the function call in the previous example is equivalent to
the expression
<pre class="example"> i1 = {1,2}; i2 = "fd"; i3 = {3}; i4= "b";
ss(i1{:}).(i2)(i3{:}).(i4)
</pre>
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dsetfield.html#doc_002dsetfield">setfield</a>, <a href="doc_002drmfield.html#doc_002drmfield">rmfield</a>, <a href="doc_002disfield.html#doc_002disfield">isfield</a>, <a href="doc_002disstruct.html#doc_002disstruct">isstruct</a>, <a href="doc_002dfieldnames.html#doc_002dfieldnames">fieldnames</a>, <a href="doc_002dstruct.html#doc_002dstruct">struct</a>.
</p></blockquote></div>
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<p><a name="doc_002dsubstruct"></a>
<div class="defun">
— Function File: <b>substruct</b> (<var>type, subs, <small class="dots">...</small></var>)<var><a name="index-substruct-381"></a></var><br>
<blockquote><p>Create a subscript structure for use with <code>subsref</code> or
<code>subsasgn</code>.
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<p class="noindent"><strong>See also:</strong> <a href="doc_002dsubsref.html#doc_002dsubsref">subsref</a>, <a href="doc_002dsubsasgn.html#doc_002dsubsasgn">subsasgn</a>.
</p></blockquote></div>
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